Interesting slides.

XPath - XML Path Language

View more presentations from yht4ever.

Check out this SlideShare Presentation:

XML and XPath with PHP

View more presentations from Tobias Schlitt.

The major drawback of these lessons is that they don't take the DOM into account. A better approach would be instead:

1. First: what is XML
2. Second: what is the DOM
3. Third: what are XPath and XSLT (they go together)

However, this guy is cool and knowledgeable. :-)